Home
Class 12
PHYSICS
An achromatic converging combination of ...

An achromatic converging combination of focal length 60m is formed by placing a convex lens of crown glass and a concave lens of fibt glass in contact with each other. Calculate their focal lengths. If dispersive power of crown glass is `0.03` and that of flint glass is 0.05 .

Promotional Banner

Topper's Solved these Questions

  • CAPACITORS

    NN GHOSH|Exercise Exercise|40 Videos

  • COMBINATION OF CAPACITORS

    NN GHOSH|Exercise EXERCISE|34 Videos

Similar Questions

Explore conceptually related problems

If a convex lens of focal length 20 cm and a concave lens of focal length 30 cm are kept in contract with each other. What will be the focal length of the combination ?

If the convex lens of focal length 10 cm and a concave lens of focal length 50 cm are kept in contact with each other. What will be the power of combination ?

If the convex lens of focal length 10 cm and a concave lens of focal length 50 cm are kept in contact with each other. What will be the focal length of the combination ?

A concave lens of focal length 12 cm and a convex lens of focal length 20 cm are kept in contact with each other . Find the focal length of the combination .

An achromatic convergent lens of focal length 150 cm is made by combining flint and crown glass lenses. Calculate the focal length of both the lenses and point out which one is divergent if the ratio of the dispersive power of flint and crown glasses is 3:2.

A plano - convex lens is made of flint glass. Its focal length is

A convex lens of focal length x and a concave lens of focal length y are placed in contact. The focal length of the combination is

A convex lens of focal length A and a concave lens of focal length B are placed in contact. The focal length of the combination is

If a convex lens of focal length 20 cm and a concave lens of focal length 30 cm are kept in contract with each other. What will the power of the combination ?